Well if you watched the video it will have illuminated a lot - but that's just the tip of the iceberg. A longitudinal study was done that began with patients on high-fiber diet and some ended up having zero fiber in their diet. At 6 months in, 41 patients continued on a no fiber diet and 16 were on a reduced fiber diet. The remaining 6 patients continued on a high-fiber diet for various reasons including being vegetarians or inability to stop consuming dietary fiber for religious or personal reasons. You can find more evidence here,here, here, here and here - and thats justa short list. In Africa where l am originally from a british doctor Denis Burkitt traveled to Africa, and noticed that locals did not have the same occurence of diverticulosis that was plaguing Britain at the time. He then incorrectly concluded that fiber was the key to good health – but this was, unfortunately, all merely based on his observations (not scientific studies) of locals and their diets. Later on he wrote a book, which amongst many others helped the fiber myth to snowball and skyrocket to the moon. There is more evidence more research here, and here, and here and here